His Highness the Emir Sheikh Tamim bin Hamad al-Thani visited yesterday the 28th Doha International Book Fair at Doha Exhibition and Convention Centre. His Highness toured the pavilions of the exhibition where he was briefed on the participation of the government organisations, the cultural sectors, and also the Arabic and international publishing houses, as well as the latest publications, books and manuscripts displayed in the exhibition, which is being held under the slogan of ,towards a knowledgeable society,